Skip to main content
. Author manuscript; available in PMC: 2010 Jul 30.
Published in final edited form as: Int J Lang Commun Disord. 2009 Sep-Oct;44(5):600–615. doi: 10.1080/13682820802259662

Table 4.

Sensitivity and specificity of diagnostic criteria in relation to actual referral status

Referral status:
Meeting LI criterion
(quadrant)		 Measures NR,
no
(A)		 NR,
yes
(B)		 CR,
no
(C)		 CR,
yes
(D)		 Specificity Sensitivity Optimality
index*
Discriminant function See the text 149 44 14 38 0.91 0.46 0.46
One measure lower than −2 SD Language tests 159 34 25 27 0.86 0.44 0.43
CCC-2 scales 155 38 23 29 0.87 0.43 0.42
Both 181 12 35 17 0.84 0.59 0.56
Either 133 60 13 39 0.91 0.39 0.39
*

With sensitivity plotted versus specificity, it is computed as 1 minus the length of the vector from perfect sensitivity and specificity, i.e. the higher the optimality index, the closer the agreement with perfect sensitivity and specificity.

CR, clinically referred; NR, not referred; SD, standard deviation.